[kragen]

That sounds pretty counterproductive. So now authors, in addition to keeping up on their research, need to keep up on the updates to the ACM's LaTeX stylesheet? And there's every chance that the version that is formatted well with the ACM stylesheet when you initially submit will have formatting bugs six months later because the template got updated? And now you have a whole new toolchain to debug when the HTML version of your paper misaligns your tables? And maybe the HTML version that looks fine today will get mangled in 2028 after you retire and they update the CSS, as has happened with most of the New York Times articles?

It sounds like the ACM has a really different set of priorities than libraries and researchers do, one that values increasing headcount over guaranteeing permanence.